Multiple choice

The phenomenon known as “Early Effect” in a bipolar transistor refers to a reduction of the effective base-width caused by

  1. electron-hole recombination at the base

  2. the reverse biasing of the base-collector junction

  3. the forward biasing of emitter-base junction

  4. the early removal of stored base charge during saturation-to-cutoff switching
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In BJT as the reverse bias voltage increases, The B-C space charge region which increases which $x_B$ (i.e. neutral base width) > A change in neutral base width will change the collector current. A reduction in base width will causes the gradient in minority carrier concentration to increase., which in turn causes an increase in the diffusion current This effect is known as base modulation as early effect.

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